Cartwheel galaxy, multi-wavelength image
Cartwheel galaxy, multi-wavelength image. Around 100 million years ago, a smaller galaxy passed directly through the centre of the Cartwheel galaxy. This caused shock waves to propagate out through the galaxy, which caused bursts of star formation. The bright blue ring marks the region where huge, powerful ultraviolet-emitting stars have formed. The inner orange ring is the second wave, but this has far less star formation than the first wave. It is not known if the colliding galaxy was one of the two at lower left. The images were taken in X-rays by the Chandra Space Telescope (purple), in UV by GALEX (blue), in green light by the Hubble Space Telescope, and in infrared by the Spitzer Space Telescope (red).
© Nasa/Jpl-caltech/Science Photo Library
Barred Spiral Galaxy NGC 1672 in Dorado
NGC 1672 is a prototypical barred spiral galaxy in the constellation Dorado, and differs from normal spiral galaxies in that the spiral arms do not twist all the way into the centre. Instead, they are attached to the two ends of a straight bar of stars enclosing the nucleus.
© Robert Gendler/Stocktrek Images
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A stellar nursery known as R136 in the 30 Doradus Nebula
A massive, young stellar nursery known as R136, located in the 30 Doradus Nebula, a turbulent star-birth region in the Large Magellanic Cloud, a satellite galaxy of our Milky Way. There is no known star-forming region in our galaxy as large or as prolific as 30 Doradus. Many of the diamond-like icy blue stars are among the most massive stars known. Several of them are over 100 times more massive than our Sun. These hefty stars are destined to pop off, like a string of firecrackers, as supernovas in a few million years. The blue color is light from the hottest, most massive stars; the green from the glow of oxygen; and the red from fluorescing hydrogen.
© Stocktrek Images